Adam Powell, 41, appeared in the doorway of a Starbucks and 'attempted to assassinate' the two officers on Sunday, Vallejo Police Chief Andrew Bidou said.
The officers were not injured because the battered weapon, its butt covered with duct tape or foil, appeared to jam.
Powell of Suisun City was in critical condition after being shot by the officers during a foot chase.
It was the latest attack on police across the country. Earlier this month, a man in body armor shot and killed two officers in Palm Springs who were responding to a domestic disturbance call at the home of an ex-convict's family.
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